When building with gcc, I get this build warning for hyphen.c:
> hyphen.c:268:1: warning: C++ style comments are not allowed in ISO C90
from this line:
> 268 // loading one or two dictionaries (separated by NEXTLEVEL keyword)
Link to source:
http://hunspell.cvs.sourceforge.net/viewvc/hunspell/hyphen/hyphen.c?revision=1.4&view=markup#l268
That just needs to be converted to /* ... */-style.